The earth is our home. It ______________ well.
A. must be protected B. should protect C. need protect D. need protecting
They can’t go out to work the heavy rain.
A. because B. since C. because of D. as a result
－Where _______ the 2008 Olympic Games _______?.
－You don’t know? Beijing!
A. will; hold B. has; been held C. was; held D. will; held
______ he is very busy, Li Ming always helps others.
A. Although B. If C. Unless D. Since
The visitors our factory two days ago.
A. got B. reached in C. arrived D. reached
The story happened ________ the 19th century
A. in B. at C. on D. of
